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LTC3561

3561f

PVIN, SVIN Voltages .....................................– 0.3V to 6V

VFB, SHDN/RT Voltages ................ – 0.3V to (VIN + 0.3V)

ITH Voltage ................................................–0.3V to 1.4V

SW Voltage ................................... – 0.3V to (VIN + 0.3V)

Operating Ambient Temperature Range

(Note 2) .................................................. – 40

°C to 85°C

Junction Temperature (Notes 5, 8) ....................... 125

°C

Storage Temperature Range ................. – 65

°C to 125°C

ABSOLUTE

AXI U

RATI GS

(Note 1)

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, RT = 324k unless otherwise specified. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN

Operating Voltage Range

2.625

5.5

IFB

Feedback Pin Input Current

(Note 3)

±0.1

µA

VFB

Feedback Voltage

(Note 3)

●

0.784

0.8

0.816

∆VLINEREG

Reference Voltage Line Regulation

VIN = 2.7V to 5V

0.04

0.2

%/V

∆VLOADREG

Output Voltage Load Regulation

ITH = 0.36, (Note 3)

●

0.02

0.2

ITH = 0.84, (Note 3)

●

– 0.02

– 0.2

gm(EA)

Error Amplifier Transconductance

ITH Pin Load = ±5µA (Note 3)

800

µS

Input DC Supply Current (Note 4)

Active Mode

VFB = 0.75V

240

350

µA

Shutdown

VSHDN/RT = 3.3V

0.1

µA

VSHDN/RT

Shutdown Threshold High

VIN – 0.6 VIN – 0.4

Active Oscillator Resistor

324k

Ω

fOSC

Oscillator Frequency

RT = 324k

0.85

1.15

MHz

(Note 7)

MHz

ILIM

Peak Switch Current Limit

ITH = 1.3

1.4

1.7

RDS(ON)

Top Switch On-Resistance (Note 6)

VIN = 3.3V

0.11

0.15

Ω

Bottom Switch On-Resistance (Note 6)

VIN = 3.3V

0.11

0.15

Ω

ISW(LKG)

Switch Leakage Current

VIN = 6V, VITH/RUN = 0V, VFB = 0V

0.01

µA

VUVLO

Undervoltage Lockout Threshold

VIN Ramping Down

2.375

2.5

2.625

PACKAGE/ORDER I FOR ATIO

TJMAX = 125°C, θJA = 43°C/W, θJC = 3°C/W

EXPOSED PAD (PIN 9) MUST BE SOLDERED TO GROUND

TOP VIEW

DD PACKAGE

8-LEAD (3mm

× 3mm) PLASTIC DFN

SHDN/RT

SGND

PGND

ITH

VFB

SVIN

PVIN

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime. No pin shall exceed 6V.

Note 2: The LTC3561E is guaranteed to meet specified performance from

°C to 85°C. Specifications over the –40°C to 85°C operating ambient

temperature range are assured by design, characterization and correlation

with statistical process controls.

Note 3: The LTC3561 is tested in a feedback loop which servos VFB to the

midpoint for the error amplifier (VITH = 0.6V).

Note 4: Dynamic supply current is higher due to the internal gate charge

being delivered at the switching frequency.

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF

Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

ORDER PART NUMBER

DD PART MARKING

Consult LTC Marketing for parts specified with wider operating temperature ranges.

LTC3561EDD

LCJJ

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